SOLUTION: how many liters of a 15% acid solution should be mixed with a 35% acid solution to make 7 liters of a 20% acid solution?

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Question 709111: how many liters of a 15% acid solution should be mixed with a 35% acid solution to make 7 liters of a 20% acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x for amount 15%, y for amount 35%

%2815x%2B35y%29%2F7=20 and x%2By=7

NOTE: Divide both sides of the fractional equation by 5 first.